Functionally Graded Magnetostrictive-Piezoelectric Layered Composites: Studies on Magneto-Electric Interactions

摘要

Ferromagnetic/piezoelectric composites show strong magnetoelectric coupling that is mediated by mechanical forces. This work is on (i) synthesis of functionally-stepped ferrite-ferroelectric composites and (ii) investigations on the magneto-electric (ME) interactions. Studies were performed on sintered samples of nickel cobalt ferrite and lead zirconate titanate (PZT). The grading parameters of interest are the piezomagnetic coefficients, q, and the piezoelectric coefficients, d. The grading in q is accomplished by compositional variation and the grading in d by poling direction. Measurements of the ME coefficient revealed the strongest coupling in functionally graded samples and the weakest for bilayers with homogeneous q and d.